There are publicity stunts and then there are publicity stunts -- Microsoft's hype for Halo: Reach includes probably the coolest PR stunt I've ever heard of. A man dressed as a Spartan showed up at London's Trafalgar Square, hit a button and flew into the air using an actual jetpack. A freakin' jetpack! Where do I sign up for that guy's job?
Yes, there's video. Check it out: